BBC releases Luther teaser; Ruth Wilson confirms return

Idris Elba fans sang from the rooftops when a fifth series of Luther was announced last year.

With four new episodes coming, the plot goes something like this:

As a series of monstrous killings becomes ever more audacious, Luther and new recruit D.S. Catherine Halliday are confounded by a tangle of leads and misdirection that seems designed to protect an unspeakable horror.

But even as the case brings him closer than ever to the nature of true evil, a reluctant Luther must also face the ghosts of his own past. Striding back into the line of fire, he must choose who to protect… and who to sacrifice.

Whatever his next move, it will have devastating consequences for those around him – and will change John Luther forever.